The father of a missing Maine toddler whose disappearance drew national attention is facing a charge of domestic violence assault.

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Portland police say Justin DiPietro of Waterville was arrested at 11:15 p.m. July 6 after a lieutenant saw him grab and push a woman on a street. Officials identified her as DiPietro's former girlfriend and say she wasn't injured.

DiPietro's daughter, Ayla Reynolds, hasn't been seen since she was reported missing Dec. 17, 2011, from DiPietro's mother's home in Waterville, where DiPietro lived. Ayla was 20 months old at the time.

Police have called the case the biggest criminal investigation in Maine history.

DiPietro, who's free on bail, couldn't be reached for comment. His cellphone number is no longer in service, and a new number in his name could not be located.